George s



(No Mcdel.) 2 Sheets-Sheet 1.

G. S. STRONG. SMOKE BOX.

No. 425,267. Patented Apr. 8. 1890.

Znew s: v X7}, Inmenior:

m: MORRIS =z1'ens cm. sun'rmrmm wnmuman. n. c.

2 Sheets-Sheet 2.

(No Model.)

G. s. STRONG. SMOKE Box;

Patented Apr. 8, 1890.

[All/ENTOI? WITNESSES:

A TTOH/VEYJ me now: PETERS co., mom-mum msmnmuu, n. c.

UNITED STATES PATENT OFFICE.

GEORGE S. STRONG, OF NEW YORK, N. Y.

SMOKE-BOX.

SPECIFICATION forming part of Letters Patent No. 425,267, dated April 8, 1890.

Application filed August 14, 1889.

To all whmn it may concern:

Be it known that I, GEORGE S. STRONG, of New York city, New York, and a citizen of the United States, have invented certain Improvements in Smoke-Boxes for Locomotives, of which the following is a specification.

My invention consists of certain improvements in the construction of smoke-boxes for furnaces, more especially locomotive-furnaees.

In the accompanying drawings, Figurel is a vertical section of a smoke-box of a locomotive, illustrating my improvements. Fig. is a front elevation, and Fig. 3 is a plan View illustrating the construction of the door-hinge.

Referring to Fig. 1, A represents the front tube-sheet of the boiler, and B the front plate of the locomotive, which I prefer to form of sheet-steel. D is the exhaust-nozzle. E is the petticoat-pipe, with adjustable head e, and F is the chimney. Around the lower part of the petticoat-pipe E is placed a transverse screen S, of perforated metal or wiregauze, resembling in shape somewhat the bridge-wall of a furnace. The petticoat-pipe passes up through the center of this bridgewall spark-arrester. Behind the spark-arrester screen is a discharge-outlet s, leading to a receptacle for the sparks. Around the upper part of the pipe E is a corresponding inverted bridge-wall screen of perforated metal or wire-gauze s.

I prefer to construct the body of the door on the front part of the smoke-box of sheet metal, with an annular flange or rim g to fit over the outwardly projecti ng flange b around the door-opening in the front plate of the smoke-box. This fiangeb is either made conical or flaring, as illustrated in Fig. 1, so that when the door is pressed down upon it the flange of the door will embrace and form atight joint with the flaring portion of the flange upon the front plate. The door has a double hinge H, Figs. 2 and 3, by means of pins h passing through lugs f on the front plate and lugs j on the door and through an intermediate hinge-piece k. If the front plate of the smoke-box and the door are formed of sheet-steel, the lugs '6 may be punched up in Serial No. 320,748. (No model.)

one piece with the front plate and the lugs j in one piece with the door. To close the door tight and to lock it when closed, I prefer to use internal bolts L, (four in the present instance,) pivoted to a central diskZ and guided 'near their outer ends in lugs 1, carried by the door. The outer ends of the bolts are preferably beveled, as shown in Fig. 1. The disk Z is carried on the inner end of a screw-stem M, passing through a threaded opening in a casting m, carried bythe door, and to this screw may be secured the usual name or number plate N, for use also as an operatinghandle. On turning the screw-stem in one direction the "locking-bolts carried by the diskl will be drawn inward by the crank action of their connections with the disk, and similarly on turning the stem and disk in the opposite direction the locking-bolts will be thrown out. The thread of the stem M is so arranged that in turning the disk to throw the bolts outward to lock the door the disk Z will be moved inward longitudinally with the screw-stem and the inner ends of the locking-bolts will be moved correspondingly. As these bolts bear at 1: against their guiding-lugs Z the beveled ends of the bolts will be pressed outward against the inner flaring edge of the opening in the front plate, thus drawing the door down tightly over the conical or flaring flange b of the front plate.

I prefer to affix to the lugs Z a plate 1), to protect these parts from the action of the products of combustion.

I claim as my invention-- 1. The combination of the front plate of a smoke-box, having around its door-opening a flaring flange, with a sheet metal door having a flange to embrace and bear against the flaring portion of the flange of the front plate to form a tight jointtherewith, and locking devices for the door, all substantially as described.

2. Thecombination of the front plate of a smoke-box, having around its door-opening a flaring flange, with a door having a flange to make a tight joint therewith, and carrying in ternal locking-bolts with beveled ends to bear against the inside of the front plate.

3. The combination of a smoke-box audits door with a screw-stem and disk' and bolts pivoted thereto; and guide-lugs for the bolts, which bear against the inside of the front 5 plate to lock the door.

4:. The combination of the sheet-metal front" plate of a locomotive smoke-boX,11aving1ngs formed in one piece with it, with a flanged door having lugs in one piece with it, and an 

